Revert "opencl: avoid uncoalesced memory accesses in module nlmeans"

This reverts commit c77838b0c1ecf760126c2edef070f00e5181de6b.

Was not working as expected and in fact runs slower than before.
Revert "opencl: avoid uncoalesced memory accesses in module denoiseprofile"

This reverts commit ef23e5a6f1fc7630138634d2701ab8af3f691a24.

Does not work as expected and in fact runs slower than before.